616116509 has 2 divisors, whose sum is σ = 616116510. Its totient is φ = 616116508.

The previous prime is 616116503. The next prime is 616116517. The reversal of 616116509 is 905611616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 411197284 + 204919225 = 20278^2 + 14315^2 .

It is a cyclic number.

It is not a de Polignac number, because 616116509 - 2⁴ = 616116493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616116503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308058254 + 308058255.

It is an arithmetic number, because the mean of its divisors is an integer number (308058255).

Almost surely, 2^616116509 is an apocalyptic number.

It is an amenable number.

616116509 is a deficient number, since it is larger than the sum of its proper divisors (1).

616116509 is an equidigital number, since it uses as much as digits as its factorization.

616116509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 616116509 is about 24821.6943217017. The cubic root of 616116509 is about 850.9178132203.

The spelling of 616116509 in words is "six hundred sixteen million, one hundred sixteen thousand, five hundred nine".